<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      div {
        background: inherit;
        width: 250px;
        height: 350px;
        position: absolute;
        overflow: hidden; //adding overflow hidden
      }
      div:before {
        content: ‘’;
        width: 300px;
        height: 400px;
        background: inherit;
        position: absolute;
        left: -25px; //giving minus -25px left position
        right: 0;
        top: -25px; //giving minus -25px top position
        bottom: 0;
        box-shadow: inset 0 0 0 200px rgba(255, 255, 255, 0.3);
        filter: blur(10px);
      }
    </style>
  </head>
  <body>
    assets_index
    <div></div>
  </body>
</html>
